Download Introduction to quantum optics: from light quanta to quantum by Harry Paul PDF

By Harry Paul

The aim of this booklet is to supply a actual knowing of photons and their homes and purposes. distinct emphasis is given within the textual content to photon pairs produced in spontaneous parametric, down-conversion, which show intrinsically quantum mechanical correlations, often called entanglement, and which expand over glaringly macroscopic distances. Such photon pairs are like minded to the actual recognition of Einstein-Rosen-Podolsky sort experiments, and likewise make attainable such intriguing ideas as quantum cryptography and teleportation.

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Extra info for Introduction to quantum optics: from light quanta to quantum teleportation

Example text

If we observe such a pulse from a fixed position, we see that the electric and the magnetic field strengths – after the wavefront has reached the observer – decrease exponentially. Such a pulse cannot be monochromatic. e. 4 Spectral decomposition 25 where we have assumed, for simplicity, linearly polarized light. E is the electric field strength in the polarization direction. Next we assume that the field E(t) is zero for t < 0. e. 20) with the halfwidth ν= κ . 21) We speak of an emission “line” of width ν.

2 However, there are certain analogies with classical electrodynamics, because the superposition principle is valid in both theories. For example, the radiation field need not be monochromatic. Generally, the radiation field is a superposition of waves with different frequencies, and the frequency of the wave itself is undetermined in the sense that it can be the frequency of this particular wave as well as that of the other wave in the superposition. Also, the superposition principle plays an important role in the polarization properties of light.

Fortunately, the inclusion of the rather “inert” thermodynamic processes into the measurement can be circumvented – in favor of electric or electrochemical processes – by using the photoelectric effect, in which the incident light causes not excitation but ionization of the atoms.

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